Check the permissions user

i have some question

for example:
suppose we have the Public folder as follows:

If user enter:
-Kenshin
or /home/kenshin/Public
output:

abc: kenshin: rw

my shell:

echo "Enter User:"       read user                grep "$user" /etc/group

but not very feasible, one can help me, help me plzzz, thank very much

Do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum under special homework rules.

Please review the rules, which you agreed to when you registered, if you have not already done so.

More-than-likely, posting homework in the main forums has resulting in a forum infraction. If you did not post homework, please explain the company you work for and the nature of the problem you are working on.

If you did post homework in the main forums, please review the guidelines for posting homework and repost.

Thank You.

The UNIX and Linux Forums.